Commit 2e2cbaf9 authored Dec 09, 2020 by Al Viro

fix hostfs_open() use of ->f_path.dentry



this is one of the cases where we need to use d_real() - we are
using more than the name of dentry here.  ->d_sb is used as well,
so in case of hostfs being used as a layer we get the wrong
superblock.

Reported-by: Johannes Berg <johannes@sipsolutions.net>
Tested-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

parent 1a97d899

fs/hostfs/hostfs_kern.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -315,7 +315,7 @@ retry:
		if (mode & FMODE_WRITE)
		r = w = 1;

		name = dentry_name(file->f_path.dentry);
		name = dentry_name(d_real(file->f_path.dentry, file->f_inode));
		if (name == NULL)
		return -ENOMEM;

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